Proton binding characteristics of dissolved organic matter extracted from the north atlantic
Marine dissolved organic matter (DOM) presents key thermodynamic properties that are not yet fully constrained. Here, we report the distribution of binding sites occupied by protons (i.e., proton affinity spectra) and parametrize the median intrinsic proton binding affinities (log K-H) and heterogen...
| Authors: | ; ; ; ; |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 2024 |
| Country: | España |
| Institution: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repository: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:10459.1/465073 |
| Online Access: | https://doi.org/10.1021/acs.est.3c01810 https://hdl.handle.net/10459.1/465073 |
| Access Level: | Open access |
| Keyword: | DOM Nonideal competitive adsorption (NICA) Donnan |
| _version_ | 1878741696439648256 |
|---|---|
| author | Lodeiro, Pablo |
| author2 | Rey-Castro, Carlos David, Calin Humphreys, Matthew P. Gledhill, Martha |
| author2_role | author author author author |
| author_browse | David, Calin Gledhill, Martha Humphreys, Matthew P. Lodeiro, Pablo Rey-Castro, Carlos |
| author_facet | Lodeiro, Pablo Rey-Castro, Carlos David, Calin Humphreys, Matthew P. Gledhill, Martha |
| author_role | author |
| collection | Recercat. Dipósit de la Recerca de Catalunya |
| description | Marine dissolved organic matter (DOM) presents key thermodynamic properties that are not yet fully constrained. Here, we report the distribution of binding sites occupied by protons (i.e., proton affinity spectra) and parametrize the median intrinsic proton binding affinities (log K-H) and heterogeneities (m), for DOM samples extracted from the North Atlantic. We estimate that 11.4 +/- 0.6% of C atoms in the extracted marine DOM have a functional group with a binding site for ionic species. The log K-H of the most acidic groups was larger (4.01-4.02 +/- 0.02) than that observed in DOM from coastal waters (3.82 +/- 0.02), while the chemical binding heterogeneity parameter increased with depth to values (m(1)= 0.666 +/- 0.009) ca. 10% higher than those observed in surface open ocean or coastal samples. On the contrary, the log K-H for the less acidic groups shows a difference between the surface (10.01 +/- 0.08) and deep (9.22 +/- 0.35) samples. The latter chemical groups were more heterogeneous for marine than for terrestrial DOM, and m(2) decreased with depth to values of 0.28 +/- 0.03. Binding heterogeneity reflects aromatic carbon compounds' persistence and accumulation in diverse, low-abundance chemical forms, while easily degradable low-affinity groups accumulate more uniformly in the deep ocean. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_e9c4c99fbaaa09dcb01c19e8e5b3ae2a |
| institution | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| instname_str | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:recercat.cat:10459.1/465073 |
| publishDate | 2024 |
| publishDateSort | 2024 |
| publisher | American Chemical Society |
| publisherStr | American Chemical Society |
| reponame_str | Recercat. Dipósit de la Recerca de Catalunya |
| spelling | Proton binding characteristics of dissolved organic matter extracted from the north atlantic Lodeiro, Pablo Rey-Castro, Carlos David, Calin Humphreys, Matthew P. Gledhill, Martha DOM Nonideal competitive adsorption (NICA) Donnan Marine dissolved organic matter (DOM) presents key thermodynamic properties that are not yet fully constrained. Here, we report the distribution of binding sites occupied by protons (i.e., proton affinity spectra) and parametrize the median intrinsic proton binding affinities (log K-H) and heterogeneities (m), for DOM samples extracted from the North Atlantic. We estimate that 11.4 +/- 0.6% of C atoms in the extracted marine DOM have a functional group with a binding site for ionic species. The log K-H of the most acidic groups was larger (4.01-4.02 +/- 0.02) than that observed in DOM from coastal waters (3.82 +/- 0.02), while the chemical binding heterogeneity parameter increased with depth to values (m(1)= 0.666 +/- 0.009) ca. 10% higher than those observed in surface open ocean or coastal samples. On the contrary, the log K-H for the less acidic groups shows a difference between the surface (10.01 +/- 0.08) and deep (9.22 +/- 0.35) samples. The latter chemical groups were more heterogeneous for marine than for terrestrial DOM, and m(2) decreased with depth to values of 0.28 +/- 0.03. Binding heterogeneity reflects aromatic carbon compounds' persistence and accumulation in diverse, low-abundance chemical forms, while easily degradable low-affinity groups accumulate more uniformly in the deep ocean. We thank the captain and crew of R/V Meteor, chief scientists A. Koschinsky and M. Frank, and A. Mutzberg for the nutrient analysis. The authors gratefully acknowledge support from the Deutsche Forschungsgemeinschaft (Project GL 807/2) and for funding R/V Meteor cruise M147, the German Helmholtz Association, and Grants PID2019-107033GB-C21, PID2020-117910GB-C21, and PID2022-140312NB-C21funded by MCIN/AEI/10.13039/501100011033 and FEDER funds. P.L. also acknowledges current support from the Ministerio de Ciencia, Innovacion y Universidades of Spain and University of Lleida (Beatriz Galindo Senior award number BG20/00104). American Chemical Society https://doi.org/10.1021/acs.est.3c01810 https://hdl.handle.net/10459.1/465073 |
| spellingShingle | Proton binding characteristics of dissolved organic matter extracted from the north atlantic Lodeiro, Pablo DOM Nonideal competitive adsorption (NICA) Donnan |
| status_str | publishedVersion |
| title | Proton binding characteristics of dissolved organic matter extracted from the north atlantic |
| title_full | Proton binding characteristics of dissolved organic matter extracted from the north atlantic |
| title_fullStr | Proton binding characteristics of dissolved organic matter extracted from the north atlantic |
| title_full_unstemmed | Proton binding characteristics of dissolved organic matter extracted from the north atlantic |
| title_short | Proton binding characteristics of dissolved organic matter extracted from the north atlantic |
| title_sort | Proton binding characteristics of dissolved organic matter extracted from the north atlantic |
| topic | DOM Nonideal competitive adsorption (NICA) Donnan |
| topic_facet | DOM Nonideal competitive adsorption (NICA) Donnan |
| url | https://doi.org/10.1021/acs.est.3c01810 https://hdl.handle.net/10459.1/465073 |